[Zope] can not use -L in zope startup

Hi, I would like to use Unicode support in Zope (to use non ASCII characters in structured text) However when I try to start zope with the -l command line switch I get an error. The specified locale is not supported by your system. See your operating system documentation for more information on locale support. I tried to set the environment variable LC_ALL to different values. Always to the same effect. This is on both win2000 and Linux. What can I do ? thanks Robert